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"I saw two guys, one being walked away from car by armed police man and police had the other guy out flat on the road."

A spokesperson for the Metropolitan Police said: "Four men have been arrested and a suspected firearm recovered following a vehicle stop by armed police on the A13 junction with Prince Regent Lane, E13 at 1556hrs on Monday, 21 May.

"Temporary road closures have now been lifted. All four male (no further details) have been taken to separate east London police stations for questioning.